I used AUDIO EXCITERS from Parts Express behind the drywall to turn the wall itself into a speaker, and the results are terrific!

PARTS USED:
8 - Dayton Audio DAEX32QMB-4 Quad Feet Mega Bass 32mm Exciter 40W 4 Ohm - https://www.parts-express.com/Dayton-...

4 - Dayton Audio DAEX32EP-4 Thruster 32mm Exciter 40W 4 Ohm - https://www.parts-express.com/Dayton-...

Speaker Protector Inline High Pass Filter 300 Hz/150 Hz (aka Bass Blockers) - https://www.parts-express.com/Speaker...



VIDEOS THAT INSPIRED THIS PROJECT:
This is the first video that caught my attention and is very in-depth:
https://www.youtube.com/watch?v=CKIye...

Here is my playlist with a total of 54 other videos (and growing) all of which cover great projects with Audio Exciters. All of which seem to have impressive results:
https://www.youtube.com/playlist?list...